Why is a 7 to 8 hours continuous sleep better than two different sleep hours which sum up to 7 or for example, 2+5 or 2+6 hours sleep? - Quora
Why is it that when I wake up in the middle of the night and go right back to sleep, I am still tired in the morning even if I get 7+
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Why Do I Feel Tired After 8 Hours of Sleep?: Christopher J. Riegel, M.D.: Hormone Replacement Specialist
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